Mastic dispensing devices



Feb. 1, 1966 A. w. ROCKWELL, JR, ETAL 3,

MASTIC DISPENSING DEVICES 4 Sheets-Sheet 1 Filed July 1, 1964 /2 By if/zezr Arid/Z725 AMWM Robe/"t T/Brop In 1/ e 21 tom AdeZber'z W Racial/ell, Jr

Feb. 1, 1966 A. w. ROCKWELL, JR., ETAL 3,232,496

MASTIC DISPENSING DEVICES 4 Sheets-Sheet 2 Filed July 1, 1964 Feb. 1, 1966 A. W. ROCKWELL, JR, ETAL MASTIC DISPENSING DEVICES 4 Sheets-Sheet 5 Filed July 1, 1964 Feb. 1, 1966 A. w. ROCKWELL, JR., ETAL 3,

MASTIC DISPENSING DEVICES Filed July 1, 1964 4 Sheets-Sheet 4 United States Patent Filed July 1, 1964, Ser. No. 379,666 6 Claims. (Cl. 222309) This invention relates to shoe machinery and more particularly to a mastic extruding device which will dispense an adhesive mastic of the type suitable for permanently attaching heels to shoes.

It has been found that the attaching of womens high heels by a drive screw and an adhesive mastic, rather than the drive screw in combination with gang nailing, provides advantages of stronger holding power plus making possible the performance of the entire heel attaching operation without removing the shoe from the last.

An object of the invention is to provide a device for dispensing a predetermined quantity of adhesive mastic for the purpose of securing a heel on a shoe.

Another object is to provide such a device which is power operated.

Still another object is to provide such a device which is economical in its fabrication and in its operation.

To this end there is provided a pliable tube filled with mastic and a roller which, upon signal from the operator, is moved to apply compressive pressure progressively along the tube, thereby forcing the mastic out of the end of the tube. The pliable tube extends from a container,

r reservoir, to which it is attached and is disposed within a rigid longitudinally slotted tubular member. The roller is movable into the slot in the tubular member and engages with the pliable tube so as to press it against the interior wall of the rigid tubular member. The roller is movable longitudinally in the slot and thereby provides a progressive compressing effect substantially along the length of the pliable tube. Means are provided for moving the roller into the slot so as to compress the pliable tube, and for then moving the roller longitudinally in the slot. The means for moving the rollers comprise pneumatic cylinders which cooperate in timed relationship to elfect the proper movements of the roller. It has been found desirable to have the mastic dispenser attached directly to a drive screw machine.

The above and other features of the invention, including various novel details of construction and combination of parts, will now be more particularly described with reference to the accompanying drawings and pointed out in the claims. It will be understood that the particular machine embodying the invention is shown by way of illustration only and not as a limitation of the invention. The purpose and features of this invention may be employed in varied and numerous arrangements without departing from the scope of the invention.

In the drawings, FIG. 1 is a perspective view of a dispenser embodying the invention, shown attached to a drive screw heel attaching machine.

FIG. 2 is a side elevation showing the roller in its upper position;

FIG. 3 is a side elevation, partly in section, with phantom positions illustrating the compressive movement of the roller, and showing the roller nearing completion or" a downward stroke;

FIG. 4 is a plan view, partly in section, showing the compressive etlect of the roller when in either of the positions shown in FIG. 3;

FIG. 5 is a diagrammatic showing of the pneumatic system of the dispenser.

The device is illustrated attached to a drive screw "ice machine, generally designated D in FIG. 1 of the drawings, which may be of the type disclosed in United States Patent No. 2,428,047 issued September 30, 1947, to I. F. Standish, or of any type commonly referred to as a drive screw or heel fastening machine. A mounting plate 4 is fastened to a U-bracket 2 which is secured to the side of the drive screw machine D. A container receptacle 6 is fixed to the mounting plate 4 and is supported by a brace 8 which is also attached to the mounting plate 4. The container receptacle 6 is mounted generally horizontally with the top open to receive a container C (FIG. 2) of mastic M enclosed in its cardboard packing box B. The mastic M may be of the type disclosed in United States Patent No. 2,975,445 issued March 21, 1961, to J. F. Leahy. The receptacle 6 has an opening 10 through which a spout of the plastic container C extends in a downward direction.

A tube guide 12, attached to the mounting plate 4 has an opening 14 which is aligned with the opening 16 in the bottom of the container receptacle 6. Fixed to the underside of the tube guide 12 is a vertical tubular member 16 having a vertical slot 13 on the front thereof. The tubular member 16 is adapted to receive internally a pliable tube 20 which has a threaded cap 22 fixed to one end, the threaded cap being engageable with a threaded opening on the mastic container C. The tube 20 is disposed within the tubular member 16 and extends beyond the tubular member at its lower end.

A mounting block 24 is attached to the mounting plate 4 and by means of a pivot pin 26 pivotally holds one end of a pneumatic cylinder 28, known as the push-down cylinder. The cylinder 28 has a piston rod 30 which has attached to its free end a roller bracket 32. On the roller bracket 32 are mounted two rollers, 34 and 36, which cooperate to force the mastic from the tube 20. A pin 38 mounts the roller 34, also known as the push-down roller, on the bracket 32. The p-ushdown roller 34 is disposed within the slot 18 of the tubular member 16. It will be seen that as the piston rod 30 extends from the cylinder 28 the pushdown roller 34 travels downward in the slot 18. The pivotal mounting of the upper end of the cylinder 28 permits a slight change in the angular position of the cylinder 28, necessary to facilitate the substantially vertical line travel of the push-down roller 34.

Attached to the rearward end of the roller bracket 32 is a cylinder 42, also known as the draw-in cylinder, having a piston rod 44 to the free end of which is attached a draw-in roller mounting 4d. The roller mounting 40 is slidably disposed in the roller bracket 32 and supports the roller 36, which is also referred to as the draw-in roller. The draw-in roller 36 abuts the back of the tubular member 16 in a position substantially equal heightwise to the position of the push-down roller. The drawin roller 36 provides the compressive effect, as will be described below.

A flexible plate 46 is secured to the U-bracket 2 and has mounted on its lower end a hand knob or button 48 which is disposed directly in front of an actuating valve 50 (FIG. 2). An air switch 52 is mounted beneath the container receptacle 6 and has a plunger 54 in vertical alignment with the roller bracket 32. The air switch 52. is opened to line pressure by the plunger 54, and is exhausted by the actuating valve 50. A quick dump valve 56 (shown only in FIG. 5) is located in the air line between the air switch 52 and the cylinders 28, 42. A sequence valve 66 is attached to the upper end of the pushdown cylinder 23 (FIG. 1) and is located between the air switch 52 and the push-down cylinder 28 (FIG. 5). Referring to FIG. 5, it may be seen that the actuating valve 59, subject to pressure from a main air line L, is normally closed.

the tube.

When the device is at rest the piston rod 30 is drawn into the cylinder 28 and the roller bracket 32 is in its up position, as shown in FIG. 2. When the air line L pres sure is made available, air under pressure passes through the air switch 52 and into the rearward end of the draw-in cylinder 42. The piston rod 44 is forced out of the cylinder 42. Since the draw-in roller 44 abuts the tubular member 16 and so is unable to actually move forward, i.e., to the left as seen inthe drawing, the force exerted by the piston rod 44 does have the effect of forcing the roller bracket 32 rearward, causing the push-down roller 34 to move well inside the slot 18 and to press the pliable tube 20 against the backinside wall of the tubular member 16, as shown in phantom in FIG. 3. Thus, the draw-in cylinder serves the function of drawingthe push-down roller 34 into the tubular member 16 so as to press the pliable tube 20.

At substantially the same time air is entering the drawin cylinder 42 it is also entering the sequence valve 60. The sequence valve 66 is a time delay type valve which is closed for a sutficient length of time to permit a full stroke of the draw-in cylinder 42'before opening and permitting air to proceed to the push-down cylinder 28. Air entering the upper end of the push-down cylinder forces the piston rod 30 out of the cylinder and thereby causes the push-down roller 34 to travel down the tubular member 16, riding in the slot 18 and continuously pressing the tube 20 against the inside back wall of the tubular member 16. When the rollers reach the down position the movements of the machine are at a standstill until the operator signals for a cycle by pushing rearwardly the hand knob 48. The rearward movement of the hand knob 48 momentarily opens the spring biased actuating valve 51 permitting a surge of air to pass to the air switch 52 which switches from main air line pressure to exhaust. The draw-in cylinder 42 and push-down cylinder 28 are both spring biased so that as soon as the air pressure drops in the'cylinders the piston rods are drawn into the cylinders. The quick dump valve 56 accelerates the exhaust of air from the cylinders. Thus, the draw-in cylinder 42 releases its hold on the roller bracket 32 and the pushdown cylinder 28 returns the roller bracket to the up position.

When the roller bracket 32 reaches its upper position, a top surface of the bracket strikes the plunger 54 (FIG. 2) which reverses the air switch 52 (FIG. so that main air line pressure is again exerted on the cylinders, as heretofore described, and the pliable tube 20 is pinched downwards. Every'time the rollers move from the upper pressing position to the lower position mastic is squeezed out of The air switch 52 is mounted on a bracket 62 which isvertically adjustable sothat the position of the plunger 54 may be varied heightwise. The lower the plunger is set, the shorter will be the stroke of the rollers and the quantity of mastic extruded will be correspondingly less. In this manner the quantity of mastic extruded per stroke is selectively controlled. V v

In operation of the device, a simple clamp of any known type, or plug P (as shown in FIG. 2), is normaily used'to close the end of the pliable tube 20 during periods of nonuse, such as overnight between working days. Accordingly, the first step in the use of the machine is to remove any such clamping or plugging device. The air system of the device is then subjected to the main air line pressure as by means of a manual olf-on valve 64 (PEG. 5). As described above, the rollers make one stroke downward and stop without any effort on the part of the operator. The operator may push the hand knob 43 one or two times to cycle the rollers and clear the tube 24 of any hardened mastic. The operator may then push the hand knob 48, turn to a shoe rack in close proximity, and return to the machine with a shoe A and a heelH. The shoe is fitted onto a spindle S or" the drive screw machine D with the left hand while the right hand wipes the mastic M off at the end of the tube 20 and onto the heel. The operator then proceeds to heel the shoe. He may then, while returning the heeled shoe to the rack, hit the hand knob 48 with the shoe to start another cycle and have mastic ready for the next heel. When the container C empties, the operator removes the container and pliable tube from the receptacle 6, then unscrews the: capped tube 20 from the container C. The threaded cap: 22 is fitted onto another container and the container 0,. its shipping box B, and the tube 20, are turned upsidedown and placed in the receptacle, with the tube 20 fitted in the tubular member 16. The mastic containers C are used while still in their shipping boxes B.

The sequence valve 60 may be replaced with a valve: which is opened by the rearward movement of the roller' bracket 32. Thus, upon completion of the roller brackets'v pressing movement, a valve would be opened which would. permit air pressure to go to the push-down cylinder 28.. In this manner, the proper sequence may be insured with? out the use of a sequence valve.

Having thus described our invention, what we claim asnew and desire to secure by Letters Patent of the United States is:

1. A mastic dispensing device comprising means for supporting a container of mastic having a pliable tubular outlet attached thereto, a longitudinally slotted tubular member for receiving internally said tubular outlet, a roller movable into the slot in said tubular member in engagement with said pliable tubular outlet, means for drawing the roller into the slot whereby to press the pliable tubular outlet against the interior wall of the tubular member, means for pushing the roller progressively along said outlet, and means for selectively controlling the amount of mastic dispensed by each stroke of said roller, said controlling means comprising means for selectively varying the distance along said outlet through which the roller is progressively pushed.

2. A mastic dispensing device comprising means for supporting a container of mastic having a pliable tubular outlet attached thereto, a rigid longitudinally slotted tubular member extending'downward from the receptacle for receiving internally said pliable tubular outlet, a roller mounted on a roller bracket and disposed partially within the slot in said tubular member in engagement With said pliable tubular outlet, cylinder means mounted on said bracket for drawing the bracket rearwardly whereby forcing the roller into the slot so as to press the pliable tubular outlet against the interior wall of the rigid tubular member, and cylinder means for pushing the bracket progressively downwards, whereby the roller exercises a continuous downward pressing effect on the pliable outlet.

3. A mastic dispensing device comprising means for supporting a container of mastic having a pliable tubular outlet attached thereto, a rigid longitudinally slotted tubular member extending downward from the receptacle for receiving internally the pliable tubular outlet, a pushdown roller mounted on a roller bracket and disposed partially within the slot in said tubular member in engagement with said pliable tubular outlet, a draw-in cylinder mounted on one end of the roller bracket and having a piston rod extending therefrom toward said tubular member, a draw-in roller mounted on the free end of said piston rod and abutting the tubular member, a push-down cylinder having a piston rod which is connected to the other end of'the roller bracket, said draw-in cylinder and said push-down cylinder acting in timedv relationship whereby the draw-in cylinder is first activated, causing the roller bracket and push-down roller to move rearwardly so that the push-down roller presses the pliable outlet against the inside rear wall of the tubular member, and then the push-down cylinder is activated, causing the push-down roller to move progressively downward in the slot in the tubular member.

4. A mastic dispensing'device comprising means for supporting a container of mastic having a pliable tubular outlet'attached thereto, a longitudinally slotted tubular;

member for receiving internally said tubular outlet, a roller movable into the slot in the said tubular member in engagement with said pliable tubular outlet, means for moving the roller into the slot whereby to press the pliable tubular outlet against the interior wall of the tubular member, means for moving the roller progressively along said pliable tubular outlet, and automatic means for delaying said progressive movement of the roller until after the completion of the pressing of the pliable tubular outlet against the interior wall of the tubular member by the movement of the roller into the slot.

5. A mastic dispensing device comprising means for supporting a container of mastic having a pliable tubular outlet attached thereto, a longitudinally slotted tubular member for receiving internally said tubular outlet, a roller movable into the slot in said tubular member in engagement with said pliable tubular outlet, automatic means for moving the roller into the slot whereby to press the pliable tubular outlet against the interior Wall of the tubular member, automatic means operative after completion of the movement of the roller into the slot for moving the roller progressively along said pliable tubular outlet, and means for selectively controlling the amount of mastic dispensed by each stroke of said roller, said controlling means comprising means for selectively varying 6 the distance along said outlet through the which the roller is progressively moved.

6. A mastic dispensing device comprising means for supporting a container of mastic having a pliable tubular outlet attached thereto, a longtiudinally slotted tubular memfor receiving internally said tubular outlet, a roller movable into the slot in said tubular member in engagement with said pliable tubular outlet, means for moving the roller into the slot whereby to press the pliable tubular outlet against the interior wall of the tubular member, means for moving the roller progressively along said pliable tubular outlet, means responsive to a signal from an operator for returning the roller to the starting position of a dispensing stroke, and automatic means responsive to the return of the roller to said starting position for initiating the means for moving the roller into the slot and the means for moving the roller progressively along said pliable outlet.

References Cited by the Examiner UNITED STATES PATENTS 2,466,618 4/1949 Stocks l03149 RAPHAEL M. LUPO, Primary Examiner. HADD S. LANE, Examiner. 

1. A MASTIC DISPENSING DEVICE COMPRISING MEANS FOR SUPPORTING A CONTAINER OF MASTIC HAVING A PLIABLE TUBULAR OUTLET ATTACHED THERETO, A LONGITUDINALLY SLOTTED TUBULAR MEMBER OF RECEIVING INTERNALLY SAID TUBULAR OUTLET, A ROLLER MOVABLE INTO THE SLOT IN SAID TUBULAR MEMBER IN ENGAGEMENT WITH SAID PLIABLE TUBULAR OUTLET, MEANS FOR DRAWING THE ROLLER INTO THE SLOT WHEREBY TO PRESS THE PLIABLE TUBULAR OUTLET AGAINST THE INTERIOR WALL OF THE TUBULAR MEMBER, MEANS FOR PUSHING THE ROLLER PROGRESSIVELY ALONG SAID OUTLET, AND MEANS FOR SELECTIVELY CONTROLLING THE AMOUNT OF MASTIC DISPENSED BY EACH STROKE OF SAID ROLLER, SAID CONTROLLING MEANS COMPRISING MEANS 